The only way the US would've succeeded is if we closed borders between states. This is a big reason why the US failed to handle it as well as Europe and why Europe has it so bad now. More people moving around makes the virus worse, China massively restricted freedom of movement around the country and that shit just works.
It's easy to give complicated answers for why some countries did better than others, but totally independent of testing, mask wearing, or any other related thing, the above is easily the most important.
The only way the US would've succeeded is if we closed borders between states. This is a big reason why the US failed to handle it as well as Europe and why Europe has it so bad now. More people moving around makes the virus worse, China massively restricted freedom of movement around the country and that shit just works.
It's easy to give complicated answers for why some countries did better than others, but totally independent of testing, mask wearing, or any other related thing, the above is easily the most important.